The Best Way To Understanding Is A

Blind Metaphysical Necessity, Which Is Certainly The Same Always And Every Where, Could Produce No Variety Of Things. All That Diversity Of Natural Things Which We Find Suited To Different Times And Places Could Arise From Nothing But The Ideas And Will Of A Being, Necessarily Existing.

Our Design, Not Respecting Arts, But Philosophy, And Our Subject, Not Manual, But Natural Powers, We Consider Chiefly Those Things Which Relate To Gravity, Levity, Elastic Force, The Resistance Of Fluids, And The Like Forces, Whether Attractive Or Impulsive; And Therefore We Offer This Work As Mathematical Principles Of Philosophy; For All The Difficulty Of Philosophy Seems To Consist In This From The Phenomena Of Motions To Investigate The Forces Of Nature, And Then From These Forces To Demonstrate The Other Phenomena.

A Body In Motion Tends To Stay In Motion Unless Acted On By An Outside Force.

The Best And Safest Way Of Philosophising Seems To Be, First To Enquire Diligently Into The Properties Of Things, And To Establish Those Properties By Experiences [experiments] And Then To Proceed Slowly To Hypotheses For The Explanation Of Them. For Hypotheses Should Be Employed Only In Explaining The Properties Of Things, But Not Assumed In Determining Them; Unless So Far As They May Furnish Experiments.

When Two Forces Unite, Their Efficiency Double.